fix: error 500 in v1_get_books

Author: demartis

src/Repository/BookRepository.php

@@ -4,7 +4,7 @@
 
 use App\Entity\Book;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
-use Doctrine\Common\Persistence\ManagerRegistry;
+use Doctrine\Persistence\ManagerRegistry;
 
 /**
  * @method Book|null find($id, $lockMode = null, $lockVersion = null)